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Clarification of the disproportionation reaction of HFO-1123 and evaluation of the reaction inhibitor.

Number: No 138

Author(s) : ZHANG Z., ITO M., DANG C., HIHARA E.

Summary

The hydrofluoroolefin (HFO) refrigerant 1,1,2-trifluoroethene (HFO-1123) has a very low global warming potential (GWP) and ozone depletion potential (ODP); thus, it is proposed as a next-generation refrigerant. However, a short circuit of the motor under high-temperature and high-pressure conditions may cause a disproportionation reaction of HFO-1123. Therefore, to enable commercialization of HFO-1123 in split air conditioners, it is necessary to develop a technology to suppress the disproportionation reaction. In this study, disproportionation experiments were performed under various temperature and pressure conditions and changes due to these different pressure, temperature, and input energy were recorded. Conventionally, fusing and discharge methods are employed for ignition in experiments. Using the two ignition methods, we experimentally determined the threshold pressure of the disproportionation reaction and compared the differences in the reaction limits of the ignition methods. The disproportionation reaction was photographed with a high-speed camera, and the flame temperature was measured using the two-color temperature radiometry method (H & B method). The experiment was performed using difluoromethane (R32) and trifluoroiodomethane (R13I1) as disproportionation reaction inhibitors, and the suppression effect of the disproportionation reaction was evaluated.

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Pages: 11 p.

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Original title: Clarification of the disproportionation reaction of HFO-1123 and evaluation of the reaction inhibitor.
Record ID : 30030005
Languages: English
Subject: HFCs alternatives
Source: 13^th IEA Heat Pump Conference 2021: Heat Pumps – Mission for the Green World. Conference proceedings [full papers]
Publication date: 2021/08/31

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Indexing

Themes: HFO et HCFO;
Comfort air conditioning
Keywords: Expérimentation; /en/search; Binary mixture; Ternary mixture; Thermodynamic property; HFO; Environment